密度对不同玉米品种产量形成和耗水量的影响

Effect of Increasing Density on Output Formation and Water Consumption of Different Maize Varieties

不同密度条件下,用农大108和郑单958为材料,分析了两者的产量形成和耗水量之间的差异及原因。结果表明：同等密度条件下,郑单958产量高于农大108,并随着密度的增加,郑单958与农大108之间的产量差异增大,郑单958在高密度下产量优势更加明显;低密度下,农大108穗粒数多,郑单958百粒重大,两者产量差异不大;高密度下,郑单958的穗粒数、百粒重均高于农大108,增加密度对郑单958形成产量更有利。从干物质积累和转化的角度分析表明,低密度下,郑单958增产途径主要来源于提高收获指数;高密度下,生物量增加和收获指数提高是郑单958产量高于农大108的主要原因。在试验密度范围内,农大108和郑单958的耗水量在390-422mm,密度相差1倍左右情况下,生育期耗水量相差约30mm,耗水量差异主要来源于出苗至大喇叭口生育阶段。

Differences between output formation and water consumption of Nnongda 108 and Zhengdan 958 were analyzed under different density condition in this paper.Results shown that under the equal density,yield of Zhengdan 958 was higher than Nongda 108.Difference of both varieties was increasing with density increases,and yield advantage of Zhengdan 958 was more apparent than Nongda 108.Under low density,panicle of Nongda 108 was much more,the weight of 100 seed of Zhengdan 958 was higher,and difference of both varieties was rare.Under high density,panicle and the weight of 100 seed of zhengdan were higher than Nongda108,Which shown that increase the density of zhengdan 958 was favorable for forming production.Analyzed from dry matter accumulation and transformation,results shown that approach of increasing yield of Zhengdan 958 were from increasing harvest index under low density.Main reasons of yield of zhengdan 958 were higher than Nongda 108 was for high biomass and harvest index under high density.In the experiment,water consumption of both varieties was under 390-422mm.Density within one times,increase water consumption of growth was increased about 30mm,and difference of water consumption was mainly come from the seedling to huge bellbottom stage.